First step to move common accessibility code out of content.

ui/accessibility/ax_serializable_tree.h

Index: ui/accessibility/ax_serializable_tree.h
diff --git a/ui/accessibility/ax_serializable_tree.h b/ui/accessibility/ax_serializable_tree.h
new file mode 100644
index 0000000000000000000000000000000000000000..c70905e832a8b99e24848a14a0583417295b563b
--- /dev/null
+++ b/ui/accessibility/ax_serializable_tree.h
@@ -0,0 +1,26 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_ACCESSIBILITY_AX_SERIALIZABLE_TREE_H_
+#define UI_ACCESSIBILITY_AX_SERIALIZABLE_TREE_H_
+
+#include "ui/accessibility/ax_tree.h"
+#include "ui/accessibility/ax_tree_source.h"
+
+namespace ui {
+
+class AX_EXPORT AXSerializableTree : public AXTree {
+ public:
+  AXSerializableTree();
+  explicit AXSerializableTree(const AXTreeUpdate& initial_state);
+  virtual ~AXSerializableTree();
+
+  // Get a TreeSource interface for this tree. The client gets ownership

[aboxhall, 2013/11/18 21:57:10]

I was momentarily confused by 'Get' here. Even though it's redundant with the
method name, perhaps change to 'Create'. Also, 'interface' confuses me here too
(possibly I've just done too much Java programming). Perhaps just leave it out?
I assume it's intended to mean "TreeSource [which acts as an] interface"?

[dmazzoni, 2013/11/19 17:13:54]

Changed to "Create a TreeSource adapter".

+  // of the return value and should delete it when done.
+  virtual AXTreeSource<AXNode>* CreateTreeSource();
+};
+
+}  // namespace ui
+
+#endif  // UI_ACCESSIBILITY_AX_TREE_H_